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path: root/libavfilter/vf_kerndeint.c (plain)
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1/*
2 * Copyright (c) 2012 Jeremy Tran
3 * Copyright (c) 2004 Tobias Diedrich
4 * Copyright (c) 2003 Donald A. Graft
5 *
6 * This file is part of FFmpeg.
7 *
8 * FFmpeg is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License as published by
10 * the Free Software Foundation; either version 2 of the License, or
11 * (at your option) any later version.
12 *
13 * FFmpeg is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 * GNU General Public License for more details.
17 *
18 * You should have received a copy of the GNU General Public License along
19 * with FFmpeg; if not, write to the Free Software Foundation, Inc.,
20 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
21 */
22
23/**
24 * @file
25 * Kernel Deinterlacer
26 * Ported from MPlayer libmpcodecs/vf_kerndeint.c.
27 */
28
29#include "libavutil/imgutils.h"
30#include "libavutil/intreadwrite.h"
31#include "libavutil/opt.h"
32#include "libavutil/pixdesc.h"
33
34#include "avfilter.h"
35#include "formats.h"
36#include "internal.h"
37
38typedef struct {
39 const AVClass *class;
40 int frame; ///< frame count, starting from 0
41 int thresh, map, order, sharp, twoway;
42 int vsub;
43 int is_packed_rgb;
44 uint8_t *tmp_data [4]; ///< temporary plane data buffer
45 int tmp_linesize[4]; ///< temporary plane byte linesize
46 int tmp_bwidth [4]; ///< temporary plane byte width
47} KerndeintContext;
48
49#define OFFSET(x) offsetof(KerndeintContext, x)
50#define FLAGS AV_OPT_FLAG_VIDEO_PARAM|AV_OPT_FLAG_FILTERING_PARAM
51static const AVOption kerndeint_options[] = {
52 { "thresh", "set the threshold", OFFSET(thresh), AV_OPT_TYPE_INT, {.i64=10}, 0, 255, FLAGS },
53 { "map", "set the map", OFFSET(map), AV_OPT_TYPE_BOOL, {.i64=0}, 0, 1, FLAGS },
54 { "order", "set the order", OFFSET(order), AV_OPT_TYPE_BOOL, {.i64=0}, 0, 1, FLAGS },
55 { "sharp", "set sharpening", OFFSET(sharp), AV_OPT_TYPE_BOOL, {.i64=0}, 0, 1, FLAGS },
56 { "twoway", "set twoway", OFFSET(twoway), AV_OPT_TYPE_BOOL, {.i64=0}, 0, 1, FLAGS },
57 { NULL }
58};
59
60AVFILTER_DEFINE_CLASS(kerndeint);
61
62static av_cold void uninit(AVFilterContext *ctx)
63{
64 KerndeintContext *kerndeint = ctx->priv;
65
66 av_freep(&kerndeint->tmp_data[0]);
67}
68
69static int query_formats(AVFilterContext *ctx)
70{
71 static const enum AVPixelFormat pix_fmts[] = {
72 AV_PIX_FMT_YUV420P,
73 AV_PIX_FMT_YUYV422,
74 AV_PIX_FMT_ARGB, AV_PIX_FMT_0RGB,
75 AV_PIX_FMT_ABGR, AV_PIX_FMT_0BGR,
76 AV_PIX_FMT_RGBA, AV_PIX_FMT_RGB0,
77 AV_PIX_FMT_BGRA, AV_PIX_FMT_BGR0,
78 AV_PIX_FMT_NONE
79 };
80
81 AVFilterFormats *fmts_list = ff_make_format_list(pix_fmts);
82 if (!fmts_list)
83 return AVERROR(ENOMEM);
84 return ff_set_common_formats(ctx, fmts_list);
85}
86
87static int config_props(AVFilterLink *inlink)
88{
89 KerndeintContext *kerndeint = inlink->dst->priv;
90 const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(inlink->format);
91 int ret;
92
93 kerndeint->is_packed_rgb = av_pix_fmt_desc_get(inlink->format)->flags & AV_PIX_FMT_FLAG_RGB;
94 kerndeint->vsub = desc->log2_chroma_h;
95
96 ret = av_image_alloc(kerndeint->tmp_data, kerndeint->tmp_linesize,
97 inlink->w, inlink->h, inlink->format, 16);
98 if (ret < 0)
99 return ret;
100 memset(kerndeint->tmp_data[0], 0, ret);
101
102 if ((ret = av_image_fill_linesizes(kerndeint->tmp_bwidth, inlink->format, inlink->w)) < 0)
103 return ret;
104
105 return 0;
106}
107
108static int filter_frame(AVFilterLink *inlink, AVFrame *inpic)
109{
110 KerndeintContext *kerndeint = inlink->dst->priv;
111 AVFilterLink *outlink = inlink->dst->outputs[0];
112 AVFrame *outpic;
113 const uint8_t *prvp; ///< Previous field's pixel line number n
114 const uint8_t *prvpp; ///< Previous field's pixel line number (n - 1)
115 const uint8_t *prvpn; ///< Previous field's pixel line number (n + 1)
116 const uint8_t *prvppp; ///< Previous field's pixel line number (n - 2)
117 const uint8_t *prvpnn; ///< Previous field's pixel line number (n + 2)
118 const uint8_t *prvp4p; ///< Previous field's pixel line number (n - 4)
119 const uint8_t *prvp4n; ///< Previous field's pixel line number (n + 4)
120
121 const uint8_t *srcp; ///< Current field's pixel line number n
122 const uint8_t *srcpp; ///< Current field's pixel line number (n - 1)
123 const uint8_t *srcpn; ///< Current field's pixel line number (n + 1)
124 const uint8_t *srcppp; ///< Current field's pixel line number (n - 2)
125 const uint8_t *srcpnn; ///< Current field's pixel line number (n + 2)
126 const uint8_t *srcp3p; ///< Current field's pixel line number (n - 3)
127 const uint8_t *srcp3n; ///< Current field's pixel line number (n + 3)
128 const uint8_t *srcp4p; ///< Current field's pixel line number (n - 4)
129 const uint8_t *srcp4n; ///< Current field's pixel line number (n + 4)
130
131 uint8_t *dstp, *dstp_saved;
132 const uint8_t *srcp_saved;
133
134 int src_linesize, psrc_linesize, dst_linesize, bwidth;
135 int x, y, plane, val, hi, lo, g, h, n = kerndeint->frame++;
136 double valf;
137
138 const int thresh = kerndeint->thresh;
139 const int order = kerndeint->order;
140 const int map = kerndeint->map;
141 const int sharp = kerndeint->sharp;
142 const int twoway = kerndeint->twoway;
143
144 const int is_packed_rgb = kerndeint->is_packed_rgb;
145
146 outpic = ff_get_video_buffer(outlink, outlink->w, outlink->h);
147 if (!outpic) {
148 av_frame_free(&inpic);
149 return AVERROR(ENOMEM);
150 }
151 av_frame_copy_props(outpic, inpic);
152 outpic->interlaced_frame = 0;
153
154 for (plane = 0; plane < 4 && inpic->data[plane] && inpic->linesize[plane]; plane++) {
155 h = plane == 0 ? inlink->h : AV_CEIL_RSHIFT(inlink->h, kerndeint->vsub);
156 bwidth = kerndeint->tmp_bwidth[plane];
157
158 srcp_saved = inpic->data[plane];
159 src_linesize = inpic->linesize[plane];
160 psrc_linesize = kerndeint->tmp_linesize[plane];
161 dstp_saved = outpic->data[plane];
162 dst_linesize = outpic->linesize[plane];
163 srcp = srcp_saved + (1 - order) * src_linesize;
164 dstp = dstp_saved + (1 - order) * dst_linesize;
165
166 for (y = 0; y < h; y += 2) {
167 memcpy(dstp, srcp, bwidth);
168 srcp += 2 * src_linesize;
169 dstp += 2 * dst_linesize;
170 }
171
172 // Copy through the lines that will be missed below.
173 memcpy(dstp_saved + order * dst_linesize, srcp_saved + (1 - order) * src_linesize, bwidth);
174 memcpy(dstp_saved + (2 + order ) * dst_linesize, srcp_saved + (3 - order) * src_linesize, bwidth);
175 memcpy(dstp_saved + (h - 2 + order) * dst_linesize, srcp_saved + (h - 1 - order) * src_linesize, bwidth);
176 memcpy(dstp_saved + (h - 4 + order) * dst_linesize, srcp_saved + (h - 3 - order) * src_linesize, bwidth);
177
178 /* For the other field choose adaptively between using the previous field
179 or the interpolant from the current field. */
180 prvp = kerndeint->tmp_data[plane] + 5 * psrc_linesize - (1 - order) * psrc_linesize;
181 prvpp = prvp - psrc_linesize;
182 prvppp = prvp - 2 * psrc_linesize;
183 prvp4p = prvp - 4 * psrc_linesize;
184 prvpn = prvp + psrc_linesize;
185 prvpnn = prvp + 2 * psrc_linesize;
186 prvp4n = prvp + 4 * psrc_linesize;
187
188 srcp = srcp_saved + 5 * src_linesize - (1 - order) * src_linesize;
189 srcpp = srcp - src_linesize;
190 srcppp = srcp - 2 * src_linesize;
191 srcp3p = srcp - 3 * src_linesize;
192 srcp4p = srcp - 4 * src_linesize;
193
194 srcpn = srcp + src_linesize;
195 srcpnn = srcp + 2 * src_linesize;
196 srcp3n = srcp + 3 * src_linesize;
197 srcp4n = srcp + 4 * src_linesize;
198
199 dstp = dstp_saved + 5 * dst_linesize - (1 - order) * dst_linesize;
200
201 for (y = 5 - (1 - order); y <= h - 5 - (1 - order); y += 2) {
202 for (x = 0; x < bwidth; x++) {
203 if (thresh == 0 || n == 0 ||
204 (abs((int)prvp[x] - (int)srcp[x]) > thresh) ||
205 (abs((int)prvpp[x] - (int)srcpp[x]) > thresh) ||
206 (abs((int)prvpn[x] - (int)srcpn[x]) > thresh)) {
207 if (map) {
208 g = x & ~3;
209
210 if (is_packed_rgb) {
211 AV_WB32(dstp + g, 0xffffffff);
212 x = g + 3;
213 } else if (inlink->format == AV_PIX_FMT_YUYV422) {
214 // y <- 235, u <- 128, y <- 235, v <- 128
215 AV_WB32(dstp + g, 0xeb80eb80);
216 x = g + 3;
217 } else {
218 dstp[x] = plane == 0 ? 235 : 128;
219 }
220 } else {
221 if (is_packed_rgb) {
222 hi = 255;
223 lo = 0;
224 } else if (inlink->format == AV_PIX_FMT_YUYV422) {
225 hi = x & 1 ? 240 : 235;
226 lo = 16;
227 } else {
228 hi = plane == 0 ? 235 : 240;
229 lo = 16;
230 }
231
232 if (sharp) {
233 if (twoway) {
234 valf = + 0.526 * ((int)srcpp[x] + (int)srcpn[x])
235 + 0.170 * ((int)srcp[x] + (int)prvp[x])
236 - 0.116 * ((int)srcppp[x] + (int)srcpnn[x] + (int)prvppp[x] + (int)prvpnn[x])
237 - 0.026 * ((int)srcp3p[x] + (int)srcp3n[x])
238 + 0.031 * ((int)srcp4p[x] + (int)srcp4n[x] + (int)prvp4p[x] + (int)prvp4n[x]);
239 } else {
240 valf = + 0.526 * ((int)srcpp[x] + (int)srcpn[x])
241 + 0.170 * ((int)prvp[x])
242 - 0.116 * ((int)prvppp[x] + (int)prvpnn[x])
243 - 0.026 * ((int)srcp3p[x] + (int)srcp3n[x])
244 + 0.031 * ((int)prvp4p[x] + (int)prvp4p[x]);
245 }
246 dstp[x] = av_clip(valf, lo, hi);
247 } else {
248 if (twoway) {
249 val = (8 * ((int)srcpp[x] + (int)srcpn[x]) + 2 * ((int)srcp[x] + (int)prvp[x])
250 - (int)(srcppp[x]) - (int)(srcpnn[x])
251 - (int)(prvppp[x]) - (int)(prvpnn[x])) >> 4;
252 } else {
253 val = (8 * ((int)srcpp[x] + (int)srcpn[x]) + 2 * ((int)prvp[x])
254 - (int)(prvppp[x]) - (int)(prvpnn[x])) >> 4;
255 }
256 dstp[x] = av_clip(val, lo, hi);
257 }
258 }
259 } else {
260 dstp[x] = srcp[x];
261 }
262 }
263 prvp += 2 * psrc_linesize;
264 prvpp += 2 * psrc_linesize;
265 prvppp += 2 * psrc_linesize;
266 prvpn += 2 * psrc_linesize;
267 prvpnn += 2 * psrc_linesize;
268 prvp4p += 2 * psrc_linesize;
269 prvp4n += 2 * psrc_linesize;
270 srcp += 2 * src_linesize;
271 srcpp += 2 * src_linesize;
272 srcppp += 2 * src_linesize;
273 srcp3p += 2 * src_linesize;
274 srcp4p += 2 * src_linesize;
275 srcpn += 2 * src_linesize;
276 srcpnn += 2 * src_linesize;
277 srcp3n += 2 * src_linesize;
278 srcp4n += 2 * src_linesize;
279 dstp += 2 * dst_linesize;
280 }
281
282 srcp = inpic->data[plane];
283 dstp = kerndeint->tmp_data[plane];
284 av_image_copy_plane(dstp, psrc_linesize, srcp, src_linesize, bwidth, h);
285 }
286
287 av_frame_free(&inpic);
288 return ff_filter_frame(outlink, outpic);
289}
290
291static const AVFilterPad kerndeint_inputs[] = {
292 {
293 .name = "default",
294 .type = AVMEDIA_TYPE_VIDEO,
295 .filter_frame = filter_frame,
296 .config_props = config_props,
297 },
298 { NULL }
299};
300
301static const AVFilterPad kerndeint_outputs[] = {
302 {
303 .name = "default",
304 .type = AVMEDIA_TYPE_VIDEO,
305 },
306 { NULL }
307};
308
309
310AVFilter ff_vf_kerndeint = {
311 .name = "kerndeint",
312 .description = NULL_IF_CONFIG_SMALL("Apply kernel deinterlacing to the input."),
313 .priv_size = sizeof(KerndeintContext),
314 .priv_class = &kerndeint_class,
315 .uninit = uninit,
316 .query_formats = query_formats,
317 .inputs = kerndeint_inputs,
318 .outputs = kerndeint_outputs,
319};
320
generated by cgit at 2024-05-17 05:11:05 (GMT)